diff --git a/lib/tasks/hair_trigger.rake b/lib/tasks/hair_trigger.rake
index 892acc0..287990f 100644
--- a/lib/tasks/hair_trigger.rake
+++ b/lib/tasks/hair_trigger.rake
@@ -11,6 +11,8 @@ namespace :db do
   namespace :schema do
     desc "Create a db/schema.rb file that can be portably used against any DB supported by AR"
     task :dump => :environment do
+      next unless ActiveRecord::Base.schema_format == :ruby
+
       require 'active_record/schema_dumper'
       filename = ENV['SCHEMA'] || "#{Rails.root}/db/schema.rb"
       ActiveRecord::SchemaDumper.previous_schema = File.exist?(filename) ? File.read(filename) : nil